This is a feature on the YouLi Roadmap for the future.
If you want to see it be sure to tell us this help doc is 'helpful' below so we know to keep it prioritized.
Want to be able to have the number of spots left on your trip shown on the Trip Page?
Looking to be able to automatically have spots left shown for marketing purposes?
Want to pay to see this feature added?
Send us a support ticket and let us know. We will then put it at the front of the queue.